C# custom database engine, how to implement SQL

As a personal project, I have been developing my own database software in C#. Many current database systems can use SQL commands for queries. Is there anyone here that could point me in the right direction of implementing such a system in a database software written completely from scratch? For example a user familiar with SQL could enter a statement as a string into an application, that statement will be analyzed by my application and the proper query will be run. Does anyone have any experience with something like that here? This is probably a very unusual questions haha. Basically what I am asking,开发者_Python百科 are there any tools available out there that can dissect SQL statements or will I have to write my own from scratch for that?

Thanks in advance for any help!

(I may transfer some of my stuff to Python and Java, so any potential answers need not be limited to C#)

ALSO: I am not using any current SQL database or anything like that, my system is completely from scratch, I hope my question makes sense. Basically I want my application to be able to interface with programs that send SQL commands.

A full-on database engine is a pretty serious undertaking. You're not going to sit down and have a complete engine next week, so I'd have thought you would want to write the SQL parser piecemeal: adding features to the parser as the features are supported in the engine.

I'm guessing this is just something fun to do, rather than something you want working ASAP. Given that, I'd have thought writing an SQL parser is one of the best bits of the project! I've done lots of work with flat file database engines, because the response times required for queries don't allow a RDBMS. One of the most enjoyable bits has been adding support for SQL fragments in e.g. the UI, where response time isn't quite as vital.

The implementation I work on is plain old C, but in fact from what I've seen, most relational databases are still written primarily in C. And there is something satisfying about writing these things in a really low level language :)